PT - JOURNAL ARTICLE AU - P Börcek AU - S L Asa AU - F Gentili AU - S Ezzat AU - T-R Kiehl TI - Brain metastasis from medullary thyroid carcinoma AID - 10.1136/bcr.09.2010.3301 DP - 2010 Jan 01 TA - BMJ Case Reports PG - bcr0920103301 VI - 2010 4099 - http://casereports.bmj.com/content/2010/bcr.09.2010.3301.short 4100 - http://casereports.bmj.com/content/2010/bcr.09.2010.3301.full AB - The brain is an exceedingly rare site of metastasis in medullary thyroid carcinoma (MTC). A 50-year-old female who had a history of micro-MTC 11 years prior developed a cerebellar metastasis which was incidentally discovered. Imaging revealed a right cerebellar hemispheric mass with contrast enhancement on CT scans. Histopathologic exam demonstrated a metastatic tumour composed of nodules and sheets of large tumour cells with abundant cytoplasm. Immunohistochemistry confirmed the origin from a MTC. This case report highlights the unique features of an unusual metastatic brain tumour, which followed an indolent course for a long time despite multiple distant metastases.